diff --git a/OndselSolver/ASMTAssembly.cpp b/OndselSolver/ASMTAssembly.cpp
index 0f3dd1d..9e980f6 100644
--- a/OndselSolver/ASMTAssembly.cpp
+++ b/OndselSolver/ASMTAssembly.cpp
@@ -378,8 +378,8 @@ std::shared_ptr<ASMTAssembly> MbD::ASMTAssembly::assemblyFromFile(const std::str
     }
     auto assembly = ASMTAssembly::With();
     auto str = assembly->popOffTop(lines);
-    bool bool1 = str == "freeCAD: 3D CAD with Motion Simulation  by  askoh.com";
-    bool bool2 = str == "OndselSolver";
+    [[maybe_unused]] bool bool1 = str == "freeCAD: 3D CAD with Motion Simulation  by  askoh.com";
+    [[maybe_unused]] bool bool2 = str == "OndselSolver";
     assert(bool1 || bool2);
     assert(assembly->readStringOffTop(lines) == "Assembly");
     assembly->setFilename(fileName);
diff --git a/OndselSolver/ASMTItem.cpp b/OndselSolver/ASMTItem.cpp
index a18e7c9..f408475 100644
--- a/OndselSolver/ASMTItem.cpp
+++ b/OndselSolver/ASMTItem.cpp
@@ -191,7 +191,7 @@ void MbD::ASMTItem::createMbD(std::shared_ptr<System>, std::shared_ptr<Units>)
 	assert(false);
 }
 
-void MbD::ASMTItem::updateForFrame(size_t index)
+void MbD::ASMTItem::updateForFrame([[maybe_unused]] size_t index)
 {
     assert(false);
 }
diff --git a/OndselSolver/FullMatrix.h b/OndselSolver/FullMatrix.h
index 90e54aa..f8e5fc7 100644
--- a/OndselSolver/FullMatrix.h
+++ b/OndselSolver/FullMatrix.h
@@ -698,7 +698,7 @@ namespace MbD {
 				the1x = std::atan2(this->at(2)->at(0), sthe2z * this->at(2)->at(2));
 			}
 			the0z = std::atan2(this->at(0)->at(2), this->at(1)->at(2));
-			auto aaaa = std::atan2(this->at(0)->at(2), -this->at(1)->at(2));	//Check missing minus is needed above. Smalltalk has missing minus too.
+			[[maybe_unused]] auto aaaa = std::atan2(this->at(0)->at(2), -this->at(1)->at(2));	//Check missing minus is needed above. Smalltalk has missing minus too.
 			assert(Numeric::equaltol(the0z, aaaa, 1.0e-9));
 		}
 		answer->atiput(0, the0z);
diff --git a/OndselSolver/FullVector.h b/OndselSolver/FullVector.h
index 409470f..73f7bb9 100644
--- a/OndselSolver/FullVector.h
+++ b/OndselSolver/FullVector.h
@@ -180,7 +180,7 @@ namespace MbD {
 		}
 	}
 	template<typename T>
-	inline void FullVector<T>::conditionSelfWithTol(double tol)
+	inline void FullVector<T>::conditionSelfWithTol([[maybe_unused]] double tol)
 	{
 		assert(false && tol != tol);   // clang++ flips out with warnings if you don't use 'tol'
                                        // but suppressing that warning breaks Visual Studio.